Petrology and geochemistry of mafic rocks in the Acasta Gneiss Complex: Implications for the oldest mafic rocks and their origin
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- 作者：Keiko Koshidaa ; koshida@ea.c.u-tokyo.ac.jp" class="auth_mail" title="E-mail the corresponding author ; Akira Ishikawaa ; Hikaru Iwamorib ; Tsuyoshi Komiyaa
- 关键词：Acasta Gneiss Complex ; Eoarchean ; Hadean ; Plate tectonics ; Mantle evolution ; Trace element geochemistry
- 刊名：Precambrian Research
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：283
- 期：Complete
- 页码：190-207
- 全文大小：5210 K
文摘
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Minor mafic rocks distributed over the Acasta Gneiss Complex were examined in detail.
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Major petrochemical varieties due to anatexis followed by amphibolite metamorphism.
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The least-modified rocks preserving basaltic magma compositions were identified.
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The source mantle has chondritic incompatible element ratios, except for Nb and Ta.
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Early Eoarchean Nb-deficit mantle probably originated from the Hadean core formation.